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APPENDIX
TAP Commands for control of the 3-2-1 media center (continued) Note: In the following tables, (cr) denotes carriage return, (b) denotes space, all other characters are ASCII in the cases shown. Audio Processing Subsystem (continued)
Message Function Mute outputs Command from External MUbcbv(cr) 3-2-1 Response ACK>(cr) Comments "c" specifies which channel to mute. The values are L,C,R,LS,RS,B or ALL. "v" is either ON (muted) or OFF (un-muted). All channels can be controlled individually with a comma separated string of values. The assumed order is as above. "v" is a value between 10 and 6. Displays memory locations. "s" is the Hex starting memory address. "e" is the Hex ending memory address. "n" is the number of polls per second. "mm" is the presentation mode. 4W is 4 axis wide, 2W is two axis wide, 4N is four axis narrow and 2N is two axis narrow.

Ooze setting Peek at memory locations Set presentation mode Reset the audio DSP Surround balance control Surround configuration control Set Surround level Source select

OObv(cr) PEbs,e,n(cr)

ACK>(cr) ACK>(cr)

PMbmm(cr)

ACK>(cr)

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RE(cr) SBbv(cr) SCbcc(cr)

ACK>(cr) ACK>(cr) ACK>(cr) "v" is a value between 10 and 10. "cc" is the configuration which can be: VF for virtual-Front, RS for Real/Rear/Spitter and RF for Real/Rear/Full-Range "v" is a value between 10 and 6. "c" is the channel specified. Choices are L,C,R,LS,RS,B. "s" is the source for the channel. Choices are D for digital, A for analog, S for 1kHz sine, DL for digital left, C for center, DR for digital right, LS for left surround, RS for right surround, LFE, AL for analog left and AR for analog right.

SLbv(cr) SObcbs(cr)

ACK>(cr) ACK>(cr)

Request status information Execute a debug test Set Tone controls

ST(cr) TNbn(cr) TObc,v(cr)

TBDL ACK>(cr) ACK>(cr) "n" is the number of the test to be run. "c" is the control to be changed. The controls are B (bass), T (treble) and FE (film EQ). "v" is the value to set the control to. For B and T, the value is a number between 128 and 127. For FE, the values can be: ON for Film EQ on, OFF for film EQ off, BON for bass boost from film EQ on, BOFF which turns off the film EQ bass boost, HON for HF cut from film EQ on and HOFF which turns off the film EQ HF cut. "c" is the channel to be modified. The choices are L,C,R,LS,RS,B or ALL. "v" is the attenuation value in dB down from maximum.

Set volume

VObcbv(cr)

ACK>(cr)

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APPENDIX
Console Main PCB Video Troubleshooting and Waveforms Note: Refer the 3-2-1 Console schematics for the following information. The video circuitry will not operate without the 27 MHz video clock signal VDO_CLK. This signal originates at crystal Y7056 [sheet 5, B3], fed out as signal XM27HZ over to inverter U7008 [sheet 5, B1] and output as signal DX27MHZ. This clock signal is then sent over to pin 202 of the DVD decoder IC U3000 [sheet 12, B/C2]. It is fed out of U3000 as the buffered 27 MHz clock signal VDO_CLK at pin 154 [sheet 3, D6]. From there VDO_CLK is fed to the Video DAC U5000 [sheet 10, C7], input as pin 33. The video data bitstream signals VDO-0 to VDO-7 are fed to the Video DAC from the DVD decoder IC U3000 [sheet 3, C/D6]. The Video DAC takes the digital video bitstreams and converts them to the formats for both the composite and S-Video outputs. Video signals are made up of Luminance (Y) information (black and white) and Chrominance (C) information (color). Both of these signals combined make up composite video (CV). S-Video uses the same signals, but keeps them separate until they sent to the video monitor, resulting in better video fidelity. Combining these two signals before the video monitor results in some overall signal degradation. We will start by checking the waveforms coming out of the Video DAC U5000 [sheet 10, B/C/ D7]. You will need a 100 MHz oscilloscope with video triggering and a DC coupled scope probe to get these waveforms. Remove the top cover of the console, the DVD drive and the casting using the console disassembly/assembly procedures in this manual. Connect the bass module to the console using the system cable, or you can apply power using the test cable described earlier in the appendix. Do not connect the array speakers to the console. Apply power to the console and set the output volume all the way down to avoid overheating the amplifier IC. Select the AUX input and press SETTINGS. This will start the video circuitry running without the need for a DVD to be playing or a source to be plugged into the console. We will check the composite video (CV) output of the Video DAC U5000 at pin 44 first [sheet 10, C7]. The filter network composed of inductor L5000 and associated components filter out any residual 27 MHz artifacts. The signal at TP575 should look like the wavform at right.

Composite Video Signal at TP575 from pin 44 of U5000 78

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APPENDIX
Below is the signal at TP575 again, but expanded to show the detail of the waveform.

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Composite Video Signal (expanded) at pin 44 of U5000 Below is the unloaded composite video (CV) signal output which originates at pin 26 of U5001, the A/V MUX located at grid coordinates [sheet 10, D1]. This waveform was taken at the composite video output RCA jack at J5001 on the console rear panel. You can also see it at TP684 on the main PCB.

Composite Video Signal from pin 26 of U5001 (unloaded) 79

APPENDIX
Below is the 75 Ohm loaded composite video (CV) signal output which originates at pin 26 of U5001, the A/V MUX located at grid coordinates [sheet 10, D1]. Note that the amplitude is about half that of the unloaded waveform on the previous page. This waveform was taken at the composite video output RCA jack at J5001 on the console rear panel.

Composite Video Signal from pin 26 of U5001 (75 Ohm load) We will now look at the signal path for the luminance (Y) video information, which is the black and white component of the S-Video signal. This waveform originates at the Video DAC U5000 at pin 48 (TP139).

Luminance Video Signal from pin 48 of U5000 80

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APPENDIX
This is the same luminance (Y) video signal as the previous one, but expanded to show waveform detail. This waveform originates at the Video DAC U5000 at pin 48 (TP139).

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Luminance Video Signal (expanded) from pin 48 of U5000 Below is the luminance (Y) video signal as seen at pin 3 of the S-Video output DIN jack. This is with no load on the output. The signal originates at U5001 pin 22.

Luminance Video Signal (unloaded) S-Video DIN Connector pin 3

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APPENDIX
Below is the same luminance (Y) video signal as on the previous page, but with a 75 Ohm load. It is taken at pin 3 of the S-Video output DIN jack. Note that the waveform amplitude is about half that of the previous waveform. The signal originates at U5001 pin 22.

Luminance Video Signal (75 Ohm load) S-Video DIN Connector pin 3 We will now look at the signal path for the chrominance (C) video information, which is the color component of the S-Video signal. The waveform below originates at the Video DAC U5000 at pin 47 (TP516).

Chrominance Video Signal at U5000 pin 47 (TP516) 82

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APPENDIX
This is the same chrominance (C) video signal as the previous one, but expanded to show waveform detail. This waveform originates at the Video DAC U5000 at pin 47 (TP516).

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Chrominance Video Signal (expanded) at U5000 pin 47 (TP516) Below is the chrominance (C) video signal as seen at pin 4 of the S-Video output DIN jack. This is with no load on the output. The signal originates at U5001 pin 24.

Chrominance Video Signal (75 Ohm load) S-Video DIN Connector pin 4

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APPENDIX
Below is the same chrominance video signal (C) as on the previous page, but with a 75 Ohm load. It is taken at pin 4 of the S-Video output DIN jack. Note that the waveform amplitude is about half that of the previous waveform. The signal originates at U5001 pin 24.

Chrominance Video Signal (75 Ohm load) S-Video DIN Connector pin 4 Console Display Test Using this procedure, you will be able to verify that all of the console LCD elements work properly by lighting all of them at once. Use the following steps. 1. Remove AC mains power to the bass module. 2. Re-apply AC mains power to the bass module. Within 10 seconds of re-applying power, press the right hand three buttons on the top of the console at the same time. All of the LCD display segments should light as shown in the figure below. Note: The RDS segment is used on European models only.

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APPENDIX
Bass Module Troubleshooting Information
Note: Refer to the bass module amplifier board schematic sheet for the following information. The bass module amplifier board uses two different ground potentials. When troubleshooting, be careful that you are using the correct ground (reference) point. The ground point for the power supply circuitry is at the negative (-) side of bridge BR1. This circuitry creates the +16 VDC voltage used by the console, which is seen at the positive side of C22. The system ground point is PGND. Zener ZR1 controls the turn on / turn off of Q2, Q3 and Q1. If Q1 were to short, the symptom would be that the power supply output voltage at V (TP5) would be > 22 Vdc. This voltage is used by the console and could cause distortion at high volume levels or the console to shut down, or both.

Parental Control Information

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The parental control circuitry prevents unauthorized viewing of DVDs above a user specified setting. The user is required to set a four number password for DVDs with ratings above the rating set by the user. If a user forgets what his four number password is, he/she will not be able to view movies above the set rating. If a customer has forgotten his password, there is a generic password that can be used to bypass the lock-out. The password is BOSE (2673), as spelled on a telephone. Once the original password has been bypassed, the customer can set a new one. The parental control settings used in the 3-2-1 Home Entertainment System are from 1 to 8, with 8 being the lowest security and 1 the highest. See the table below for an listing of the settings and how they correspond to the various Motion Picture Association of America (MPAA) ratings.

DVD Rating 8 7 6 5 4 3 2 1

General Description of Rating Unrated (generally most restricted) Adult audiences Mature audiences Mature teenage audiences Teenage audiences Mature young audiences Most audiences General (unrestricted audiences)

MPAA Rating NC-17 R PG-13 PG G

Table 1. 3-2-1 Console DVD Parental Control Rating Codes

Region Code 1 2 3 4 5 6

Regions Covered U.S., Canada, Puerto Rico Europe, Middle East, Japan Southeast Asia, Hong Kong, Taiwan Central America, Mexico, South America, Australia, New Zealand Russia, Africa (except Egypt and South Africa), India, Pakistan China
Table 2. Region Codes and Covered Areas 85

Figure 17. LCD Display PCB Component and Bottom Etch Rev. 00 Diagram

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Figure 16. LCD Display PCB Component and Topside Etch Rev. 00 Diagram

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Figure 19. LCD Display PCB Component and Bottom Etch Rev. 01 Diagram

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Figure 18. LCD Display PCB Component and Topside Etch Rev. 01 Diagram

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Figure 20. Bass Amplifier PCB Rev. 00 Component and Etch Layout Diagram

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Figure 21. Bass Amplifier PCB Rev. 01 Component and Etch Layout Diagram

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GLOSSARY OF TERMS
Aspect Ratio - The shape of the rectangular picture in a TV set. It is the width of the picture relative to the height. Our standard TV picture, is 4 units wide by 3 units high, or 4:3 in aspect ratio. There are currently two standard TV aspect ratios in the U.S., 4:3 and 16:9. Chapter - In DVD-Video, a division of a title. Technically called part of a title (PTT). Component Video - A video system containing three separate color component signals, either red/ green/blue (RGB) or chroma/color difference (YPbPr), in analog or digital form. The MPEG-2 encoding system used by DVD is based on color-difference component digital video. Most televisions do not have component video inputs. Composite Video - A single video signal that contains luminance, color and synchronization information. NTSC and PAL are examples of composite video systems. Dolby Digital - Also known as 5.1, a type of multi-channel surround sound format used on discs. Dolby Digital is a perceptual coding system for audio, developed by Dolby Laboratories and is accepted as an international standard. Dolby Digital is the most common means of encoding audio for DVD-Video and is the mandatory audio compression system for 525/60 (NTSC) discs. DTS - A type of multi-channel surround sound format used on discs. DVD - An acronym that is most commonly known to mean Digital Video Disc or Digital Versatile Disc. The audio/video/data storage system based on 12 and 8 cm optical discs. DVD Video - A standard for storing and reproducing audio and video on DVD-ROM discs, based on MPEG video, Dolby Digital and MPEG audio, and other proprietary data formats. MPEG - A type of data compression used for audio or video storage on disc. MP3 - MPEG Layer 3 audio. This is a compressed audio format that allows you to record many hours of music on a single CD. NTSC - An acronym for National Television System Committe; the organization that developed both the American Black & White and Color television systems. PAL - An acronym for Phase Alternate Line. This is one of several composite video systems. The PAL format is used extensively in Western Europe. PCM - An uncompressed, digitally coded representation of an analog signal. This is the form of the digital audio signal used for both CD and laserdisc. It is a serial data stream that is coded for transmission or recording. PCM is also used for many other types of serial data communications. S-Video - A video interface standard that carries separate luminance and chrominance signals, usually on a four-pin mini-DIN connector. Also called Y/C. The quality of S-video is significantly better than composite video since it does not require a comb filter to separate the signals. Most highend televisions have S-video inputs. Title - Numbered elements of the DVD contents, which may include more than one movie alone. YPbPr - A component analog video signal containing one luminance and two chrominance components. Often referred to loosely as YUV or Y, B-Y, R-Y. 90

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3-2-1 Home Entertainment System

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©

2001 Bose Corporation

Service Manual
Part Number 263493 Rev. a